Pateick geaham



'(No Model.) I

P. GR'A HA M. Millstone Sharpener.

No. 241,351. Patented May 10,1881.

WITNESSES: Y INVENTOR:

$2 M? BY J/UMM ATTORNEYS.

N PII'ERS, Phuio-Ulhugmhhor. Washington. D C.

UNITED STATES PATENT OFFICE.

PATRICK GRAHAM, OF STOOKHOLM, SWEDEN.

MlLLSTONE-SHARPENER.

SPECIFICATION formingpart of Letters Patent No. 241,351, dated May 10, 1881. Application filed January 26, 1881. (No model.) Patented in Sweden December 24, 1880.

' To all whom it may concern Be it known that I, PATRICK GRAHAM, of Stockholm, in the Kingdom of Sweden, have invented a new and useful Improvement in 5 Millstone-Sharpeners, of which the following is a specification.

Figure 1 is a plan view of the improvement. Fig. 2 is a sectional side elevation taken through the line w as, Fig. 1. Fig. 3 is a sectional side elevation of the improvement, illustrating its use.

Similar letters of reference indicate corresponding parts.

The object of this invention is to break,

sharpen, or dress the grinding-surfaces of millstones in an expeditious and uniform manner.

The invention consists in constructing a millstone-sharpener of one or more toothed disks mounted upon or forming part of a radial arm connected with the driving-spindle, its casing, or the eye of the stone, to adapt the sharpener to break or sharpen'the grinding-surface of a millstone by being moved over the said sur or slide upon or with the arms B, as the character of the stone may require.

The sharpener A B O can be placed between two stones, as shown in Fig. 3, and made to operate by the movement of the runner, or the said sharpener can be used upon a single stone by pressing it down upon the face of the stone by a weight or other suitable means.

The disks U can be arranged to sharpen the entire surface of the stone or stones at one operation, or gradually, by giving a reciprocating motion to the cutting-dies, or at two or more operations, as may be desired.

With this construction the sharpener can be applied to horizontal and vertical stones with equal facility. Fig. 3 represents the sharpener as applied to a set of vertical stones.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A millstone-sharpener constructed substantially as herein shown and described, consisting of one or more radial arms, B, and one or more toothed disks, 0, as set forth.

2. In a millstone-sharpener, the combinasharpened, as set forth.

PATRICK GRAHAM.

Witnesses:

Orrro WESTERBERG, HJ. TORNBORG. 

